Also, add a new option: 'auto', so if there's more than one patch, the
cover letter is generated, otherwise it's not.

Signed-off-by: Felipe Contreras <felipe.contre...@gmail.com>
---
 Documentation/config.txt           |  6 ++++++
 Documentation/git-format-patch.txt |  5 +++--
 builtin/log.c                      | 22 ++++++++++++++++------
 3 files changed, 25 insertions(+), 8 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index c8e2178..c10195c 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1092,6 +1092,12 @@ format.signoff::
     the rights to submit this work under the same open source license.
     Please see the 'SubmittingPatches' document for further discussion.
 
+format.cover-letter::
+       Allows to configure the --cover-letter option of format-patch by
+       default. In addition, you can set it to 'auto' to automatically
+       determine based on the number of patches (generate if there's more than
+       one).
+
 filter.<driver>.clean::
        The command which is used to convert the content of a worktree
        file to a blob upon checkin.  See linkgit:gitattributes[5] for
diff --git a/Documentation/git-format-patch.txt 
b/Documentation/git-format-patch.txt
index 3a62f50..e1f5730 100644
--- a/Documentation/git-format-patch.txt
+++ b/Documentation/git-format-patch.txt
@@ -20,7 +20,7 @@ SYNOPSIS
                   [--ignore-if-in-upstream]
                   [--subject-prefix=Subject-Prefix] [(--reroll-count|-v) <n>]
                   [--to=<email>] [--cc=<email>]
-                  [--cover-letter] [--quiet] [--notes[=<ref>]]
+                  [--[no-]cover-letter] [--quiet] [--notes[=<ref>]]
                   [<common diff options>]
                   [ <since> | <revision range> ]
 
@@ -195,7 +195,7 @@ will want to ensure that threading is disabled for `git 
send-email`.
        `Cc:`, and custom) headers added so far from config or command
        line.
 
---cover-letter::
+--[no-]cover-letter::
        In addition to the patches, generate a cover letter file
        containing the shortlog and the overall diffstat.  You can
        fill in a description in the file before sending it out.
@@ -260,6 +260,7 @@ attachments, and sign off patches with configuration 
variables.
        cc = <email>
        attach [ = mime-boundary-string ]
        signoff = true
+       cover-letter = auto
 ------------
 
 
diff --git a/builtin/log.c b/builtin/log.c
index e4fb3c8..fab7998 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -618,6 +618,7 @@ static void add_header(const char *value)
 #define THREAD_DEEP 2
 static int thread;
 static int do_signoff;
+static int cover_letter;
 static const char *signature = git_version_string;
 
 static int git_format_config(const char *var, const char *value, void *cb)
@@ -680,6 +681,17 @@ static int git_format_config(const char *var, const char 
*value, void *cb)
        }
        if (!strcmp(var, "format.signature"))
                return git_config_string(&signature, var, value);
+       if (!strcmp(var, "format.cover-letter")) {
+               if (cover_letter != -1)
+                       /* user overrode it */
+                       return 0;
+               if (value && !strcasecmp(value, "auto")) {
+                       cover_letter = -1;
+                       return 0;
+               }
+               cover_letter = git_config_bool(var, value);
+               return 0;
+       }
 
        return git_log_config(var, value, cb);
 }
@@ -1071,7 +1083,6 @@ int cmd_format_patch(int argc, const char **argv, const 
char *prefix)
        int start_number = -1;
        int just_numbers = 0;
        int ignore_if_in_upstream = 0;
-       int cover_letter = 0;
        int boundary_count = 0;
        int no_binary_diff = 0;
        struct commit *origin = NULL, *head = NULL;
@@ -1317,11 +1328,6 @@ int cmd_format_patch(int argc, const char **argv, const 
char *prefix)
         */
        rev.show_root_diff = 1;
 
-       if (cover_letter) {
-               if (!branch_name)
-                       branch_name = find_branch_name(&rev);
-       }
-
        if (ignore_if_in_upstream) {
                /* Don't say anything if head and upstream are the same. */
                if (rev.pending.nr == 2) {
@@ -1360,6 +1366,8 @@ int cmd_format_patch(int argc, const char **argv, const 
char *prefix)
                numbered = 1;
        if (numbered)
                rev.total = total + start_number - 1;
+       if (cover_letter == -1)
+               cover_letter = (total > 1);
        if (in_reply_to || thread || cover_letter)
                rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
        if (in_reply_to) {
@@ -1371,6 +1379,8 @@ int cmd_format_patch(int argc, const char **argv, const 
char *prefix)
        if (cover_letter) {
                if (thread)
                        gen_message_id(&rev, "cover");
+               if (!branch_name)
+                       branch_name = find_branch_name(&rev);
                make_cover_letter(&rev, use_stdout,
                                  origin, nr, list, head, branch_name, quiet);
                total++;
-- 
1.8.2

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